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Finding the Fourth Proportional to 8,991.95, 12,409.01 and 5,215.28

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Solution

The fourth proportional to 8,991.95, 12,409.01 and 5,215.28 is: 7,197.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.95 : 12,409.01 = 5,215.28 : x
  2. Step 2: Convert to fraction form
    8,991.95/12,409.01 = 5,215.28/x
  3. Step 3: Cross multiply
    8,991.95x = 12,409.01 × 5,215.28
  4. Step 4: Simplify right side
    8,991.95x = 64,716,417.61
  5. Step 5: Solve for x
    x = 64,716,417.61/8,991.95
  6. Step 6: Final answer
    x = 7,197.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.